Heating-furnace.



W. FISHER.

HEATING FURNACE.

APPLICATION FILED JUNE 5, 1909.

Patented Mar. 15,1910.

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WILLIAM FISHER, OF WAYNESBURG, PENNSYLVANIA.

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HEATING-FURNACE.

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Specification of Letters Patent.

Patented Mar. s, into.

Application filed June 5, 1909. Serial No. 500,420.

provide a furnace which is extremely simple in construction, strong, and. durable, and comparatively inexpensive to manufacture; and furthermore, one that may be readily taken apart,and set up into proper position.

Another object of the invention is to provide a furnace structure in which a large radiating surface is had, andv in which the products of combustion have a tortuous passage so that all the heat given off by said products is utilized, thus effecting a saving in the cost of maintenance.

With the foregoing objects in view, theinvention consists in a novel construction and arrangement of parts to be hereinafter described and claimed, reference being had to the drawings hereto annexed in which- Figure 1 is a vertical sectional view of the furnace. Fig.2 is a horizontal section on the line 2-2 of Fig. 1. Fig. 3 is a horizontal section on the line 3 -3 of Fig. 1.

Referring to the drawings, there is shown at 5 a base ring which supports the casing of the furnacel The walls of said casing are double to prevent loss of heat, and said casing comprises inner and outer cylindrical shells 6 and 7, respectively, each of which is preferably made in two sections so that the casing may be knocked down for convenience in shipment. The sections are con-' nected by slipping the lower end of the upper section over the upper end of the lower section, there being a bead 9 on the lower section adjacent to the upper end thereof which supports the lower edge of the upper section. ny other suitable separable connection between the sections may be provided. The topof the casing is provided with a hood 10 which is also removable, and is provided with hot air outlets 11 to which the distributing pipes are connected.

Within the CQSIDO" herein described is mounted a combustion chamber which is formed by concentrically arranged drums 12 and 13, the space between said drums forming the combustion chamber. Near their lower ends the drums are tapered as indicated at 14 and 15. The drum 12 terminates in 1ts tapered portion 14, and the drum 13 has a reduced portion 15 extending below the same. The lower end of the reduced portion 15 of the drum 13 is open, and the tapered lower end 14. of the drum 12 is closed by the burner to be presently described.

At the lower end of the portion 15 of the drum 13 is located an annular smoke box 17 having adjacent to its inner periphery an upstanding flange 18 over which the said portion 15 is slipped whereby the drum is held in place on the smoke box. The upper end of the space between the drums 12 and 13 is closed by an annular cap 19 having adjacent to its inner and outer eripheries depending annular flanges 20 an 21 respectively. The flange 20 is slipped over the upper end of the'drum 12, and the flange 21 slips over the upper end of the drum 13. The cap therefore serves to close the space between the drums at the upper end thereof.

Extending between the cap 19 and the smoke box 17, are flues 22. These flues enter the top of the combustion chamber through the cap 19, and serve to carry the products of combustion from the said combustion chamber into the smoke-box 17, they entering the bottom of the latter. From the top of the smoke-box leads a flue or pipe 23 through which the fumes escape. The flues 22 are made in separable sections in order that the various parts herein described may be assembled. The joint between the flue sections may be an ordinary telescopic joint.

, The burner is a cylindrical casing 24 mounted within the reduced portion 15 of the drum 13, said casing extending concentric thereto. The casing is provided with burner openings 25, and its lower end is conical as indicated at 26. The cone-shaped lower end of the burner casing is surrounded by the smoke;box 17, there being sufficient space between said parts to permit air to flow past the burner openings 25 into the combustion chamber. Air enters the casing of the furnace through an inlet 28 at the bot tom thereof.

On the inside of the burner casing 24 is located a cylinder 14 extending concentrically to the casing and being closed and cone-shaped at its lower end as indicated at 16, said cone-shaped end being concentric to the cone-shaped portion 26 of the burner casing. The space between the burner casing and the cylinder 14 is closed at its up-.

' 1 1 also serves to close the lower end of the drum 12.

A short distance above the burner, a flue 29 extends across the combustion chamber, said flue opening at one end into the casing, and at the other end into the inner drum 12.

The casing is provided with a door 30, and in the portion 15 of the drum 13 is an opening 31 in order that access to the burner, for the purpose of lighting the same may be had, said opening being provided with a door 32.

The drum 12 is connected with the drum 13 by brackets 33. The burner is supported by the drum 12, and the drum .13 is supported on the smoke drum 17. A separable connection between these parts is had, in view of which the furnace can be shipped in knock-down form. The parts are so arran ed and constructed that they can be easi y set up or assembled. The casing of the furnace also consists of separable sections as already described.

The smoke-box 17 is supported on legs 34 secured to a band 35 clamped around said smoke-box. These legs serve to support the smoke-box andthe parts carried thereby a suitable distance above the floor.

The furnace operates as follows: Air enters the inlet 28 and passes out of the furnace through the outlets 11. A portion of the air passes into the combustion chamber. The air also passes through the fine 29 into the drum 12. The products of combustion pass upwardly into the space between the drums l2 and 13, and thence downwardly through the fines 22 into the smoke-box 17,

and out of the same through the pipe 23. By providing the herein described annular combustion chamber, a large heating surface is presented to the air in passing through the casing, and the same is rapidly heated. The air also circulates around the fines 22 and the latter form an. additional heat-radiating surface.

What is claimed is:

1. A heatin furnace comprising a casing having an air inlet at the bottom, and an air outlet at the top, concentric drums in the casing, said drums being spaced from each other and from the casing, the space between the drums forming an annular combustion chamber, and said space being closed at its upper end, and open at its lower end, the lower end of the outer drum being reduced in diameter and extending below the inner drum, and the inner drum being open at its upper end, a flue extending across the combustion chamber, said flue opening at one end into the casing, and at the other end into the inner drum, an annular burner comprising inner and outer concentric cylinders cone shaped at their lower ends, the outer cylinder having burner openings, and the inner cylinder bein closed at its lower end, and in communicatlon with, and closing the lower end of the inner one of the aforesaid drums, an annular smoke-box on which the lower end of the outer drum is supported, said smoke-box-being spaced from and surrounding the lower end of the'burner below the burner openings, flues connecting the upper end of the combustion chamber with the smoke-box, an outlet pipe from the smoke-box,'and a fuel inlet to the burner at the lower end of the outer cylinder.

2. In a heating furnace, a base, a casing removably supported thereon, an annular smoke-box, an outlet pipe from the smoke box, supporting means for the smoke box, concentric drums spaced from each other and from the casing, and removably supported on the smoke-box, the space between the drums forming a'combustion chamber, a cap removably mounted upon the upper ends of the drums, and closing the space therebetween, flues extending between the cap and the smoke-box, said flues comprising separable sections connected respectively to said cap and the smoke-box, and a burner removably supported by the inner one of the aforesaid drums at its lower end.

3. A heating furnace comprising the easing having an air inlet at the bottom, and an air out-let at the top, concentric drums in the casing, said drums being spaced from each other and from the casing, the space between the drums forming an annular comthe casing, and at the other end into the inner drum, anannular burner comprising miner and outer concentric cylinders, the

outer cylinder having burner openings, and

the inner cylinder being closed at its lower end, and in communication with and closing the inner one of the aforesaid drums, an annular smoke-box on which the lower end of the outer drum is supported, said smokebox being spaced'from and surrounding the as my own, I have hereto aflixed my signature in the presence of two witnesses.

WILLIAM FISHER.

lower end of the burner below the burner openings, flues connecting the upper end of the combustion chamber with the smoke-box, an outlet pipe from the smoke-box, and a 5 fuel inlet to the burner at the lower end of Witnesses:

the outer cylinder. v RAY L. HEADLEE,

In testimony that I claim the foregoing A. D. WOOD. 

